期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 30, 期 2, 页码 286-291出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2007.01.040
关键词
thermo-mechanical fatigue; coating; inter-diffusion zone; fatigue crack growth; single crystal nickel-base superalloy
The out-of-phase thermo-mechanical fatigue (TMF) behaviour of the single crystal superalloy CMSX-4 was studied in the uncoated and in the low-pressure plasma sprayed (LPPS) coated condition. In addition, growth measurements of in-depth coating cracks were performed. Cyclic hardening of the substrate and superimposed multiple crack initiation/propagation within the coating leads to cyclic softening that consumes a significant portion of TMF lifetime. A three-step crack propagation mode of the coated material is described. Special attention is paid to the role of the inter-diffusion zone, since coating cracks are decelerated in the inter-diffusion zone before penetrating into the substrate. (C) 2007 Elsevier Ltd. All rights reserved.
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